When a man has his prostate removed surgically the man will no longer be able to ejaculate so while the man can still have sex the man will not be able to make a baby with the woman he's having sex with.
For a man to ejaculate the man must have his prostate gland and seminal vesicles and without the seminal vesicles or prostate gland the man will no longer be able to ejaculate.
Without ejaculation of the sperm the man cannot get a woman pregnant.
The man can still have a pleasurable orgasm but it will feel different than before you had your prostate removed.
Leaking urine during sex is also another common problem men experience after having their prostate removed.